I've no idea what Cholestyramine might taste like, but here's a drink that I really enjoy that has zero sugar:
Bragg Organic Apple Cider Vinegar Drink - Limeade
https://bragg.com/products/bragg-organic-apple-cider-vinegar-drink-limeaid.htmlAt $2.99 per 16-ounce bottle, it's not cheap. But, you could probably make your own.
• Made with Bragg Organic Apple Cider Vinegar
• Blended with Organic Lime Juice and Pure Distilled Water
• Sweetened with Natural Organic Stevia
That's the only low-carb drink thing that comes to mind, as I've been eating lots of carbohydrates in general and sugar in particular.